Presser foot mechanism



Aug. 1, 1933. P. R. GLASS PRESSER FOOT MECHANISM Filed July 8, 1930 2Sheets-Sheet l Aug. 1, 1933. P. R. GLASS PRESSER FOOT MECHANISM FiledJuly 8, 1930 2 Sheets-Sheet 2 Patented Aug; 1, 1933 Ui ii i S'i ESPATENT Fries PREsssa Poor MsonANrsM Perley R. Glass, Wayland, Mass,assignor to United Shoe Machinery Corporation, Paterson, N. 5., aCorporation of New Jersey Application July 8, 1930. Serial No. 466,412

16 Claims. (01. 16l88.)

In perforating machines of the type shown. in

the Letters Patent to which reference has been made above, theintermittent feed of the work is accomplished by a punch and thepresser-foot.

is arranged to hold the work during the return movement of the punchwhile the latter is out of the work. The machine operates ata'relatively high speed, thereby militating against a theoreticallyperfect fit between the moving parts and necessitating such play orlooseness as is essential to the easy operation of the machine.Furthermore, the presser-foot in order to be effective must come downagainst the table supported work with substantial force.

An object of my invention is to improve the operation of thepresser-foot mechanism by providing an improved mechanism whereby the action of the presser-foot is softened and overthrow prevented, time atthe same time enabling the machine to operate more quietly. In theillustrated construction, in accordance with a feature of the invention,the presser-foot is mounted on a supporting rod and the reciprocation ofthis rod is effected by means of a poweroperated pitman acting'throughsuitable springs to move the rod both toward and away from the work andcommonly up and down. Thepresserfoot supporting rod is guided in a partof the frame of the machine and additionalsprings disposed betweenabutments on-said rod and said frame on opposite sides thereof areeffective to prevent overthrow of the presser-foot supporting rod on theupstroke and to absorb the re-' bound of the presser-foot supportingrod, and hence to prevent its overthrow, on the down stroke.

These and other features of the invention will be more fully set forthin the following description in which reference is made to theaccompanying drawings, in which Fig. 1 is a side elevation of aperforating machine embodying my invention;

Fig. 2 is a similar View partly in section on the line IIII of Fig. 3and taken on an enlarged scale to show the presser-foot mechanism; and

Figs. 3 and 4 are end elevations with parts broken away and in section,also on an enlarged scale, showing the presser-foot in its raised and inits lowered positions respectively. I

. The illustrated perforating machine, as in the. patented construction,has a frame provided with an'ov rhanging hollow frame arm 10 (Figs.

. 1 and 2) having a cover plate 11. In this frame aresup'portedtheoperating parts of the ma chine. The frame is also provided with anoutwardly extending base 12 having a work table 14. Onthis base there issupported an anvil 16 over the top of which is guided a punch receivingstrip 18 of paper or copper carried upon rolls 2i} and adapted to bereleasably clamped in position abovethe anvil by means ofia manuallyoperable clamping device 22. This'latter mechanism is more fully shownand described in my copending application for Letters Patent of theUnited States Serial No. 184,114, filed April 15, 1927, for improvementsin perforating machines. A depending guard 24 is provided at the frontof the machine and a piece of work 26 is laid on the work table over thestrip 18 andheld there by a presser-foot 30 to receive the impact of thetool,--here a punch 32. The punch is held in a collet 34 (Figs. 3 and 4)which in this instance has a flanged top for reception in a dovetailedslot in the punch carrier 36. The punch collet 34 is held in position inthis carrier by ,means of a clamp 38 hearing at thetop against thecarrier 36 and at'the bottom against the collet 34 and held there by aclamp screw. The collet is also held against front to back movement by aflange 35 (Fig. 2) and a screw 37. The interior of the carrier 36 ishollow and has a tube 40 for carrying punchings 'to the rear and to oneside of the point of operation.

As in the patented construction, the punch carrier 36 is supported forvertical reciprocation in a slide 42 movable from front to back (rightto left in Fig. 1) upon bearingrods 44. Operation of this slide toeffectfeeding movement of the work is effected by a cam operated lever&6 connected to the slidethrough a series of links and levers 48, 50,52. The up and down or. punching movement is effected by means of alever 54 pivoted in the frame 10 and oscillated by means of a link 56attached'to the cam lever 58. This lever 54 is pinned to a cross rod 60carrying at one end an'eccentric disk 62 having a crank pin 64 whichfits in a block 66 slidably received in a suitable slot in a pitman 68.V

5 from the punch 32, and from front to back as may be convenient inoperation of the machine. This rod 70 is slidably mounted. in an arm onthe frame and near its upper end passes.

through a frame member 76 (Fig. 3). The rod 10 '70 'carries at its upperend an abutment block 78 which slidably engages in and fits a slot 80(Fig. 2) near the top of the frame. This abutment block is clamped tothe rod 70 by a set screw 82 and prevents rotation of the presser- 15,foot carrying rod in the frame as well as serving other purposes whichwill be described. On the rod 70 below the frame member 76, there istightly clamped another abutment block 84 (Figs. 3 and i) which. extendsout into the plane of operation of the pitman 68 and is recessed toreceive the lower end of a spring 86 carried.

in a hollow portion 88 (Fig. 2) of the pitman and serving to transmitthe force of the pitman vto the presser-foot rod to carry thepresser-foot Tagainst the work. The upper end of the pitman 68 carries arod 89 guided in the abutment block '73. In order that the pressure ofthe presserfoot upon the work may be regulated in accordance with theweight and character of the work 3GTbeing treated, the pitman isprovided with an adjustable stop 90 (Fig. 2) which extendsinto thehollow portion 88 and bears against the upper portionof the spring 86.justable on the pitman by means of a screw 92 *.which is so positionedupon the outside of the machine that it is readily accessible. A looknut 94 is provided to maintain the adjustment which is made. At itslower end the pitman 68 is slottedto receive a screw 96 by means ofwhich 4(I' there is adjustably attached to the pitman a guide block 98(Figs. 3 and 4) freely slidable upon the presser rod 70. a

A coiled spring 100 surrounding the presserrod and interposed betweenthe guide block 98 45.11 of the pitman and the lower abutment block 84serves to transmit-the force of the pitman to the rod '70 and lift thepresser-foot 30. This spring is of such a length, however, as shown inFig. 4, that on the down stroke it no longer contacts 5QT5with theabutment 84; so that it does not interfere with the operation of thespring 86 as the latter urges the presser-foot against the work.Inasmuch as the upward movement imparted .to the presser-foot rod '70 isapt to cause an over- "throw of the same with resulting noise, I haveprovided a stiff spring 102 which surrounds the rod '70 betweentheabutment 84 and .the frame member '76. This stops or absorbs theoverthrow on the up stroke. I have also provided another 607 spring 104which surrounds the rod '70 between the frame member 76 and the upperabutment block '78. This catches the rebound and stops overthrow ofthepresser rod on the down stroke. As will be noted from an inspectionof Figs. 3 and 4, the springs 102 and 104 are each constructed andarranged to be inactive when the other is under tension so that theyeffect the desired result without interfering with the usual operationof the machine and to a large extent eliminate the 1 noise commonlyfound in such mechanisms.

When it is desired manually to lift the presserfoot from the work at thecompletion of a line of perforations, the presser-foot rod 70 may belifted by means of a treadle operated lever 110,

the forward end of which is positioned to under- This stop is ad-.

lie the head of a screw 112 threaded in the lower abutment block 84 andcapable of being held in adjusted position by a lock nut 114.

It is believed that the operation of the machine will be clear from thedescription given and it will be noted that the power imparted to raiseand lower the presser-foot rod 70 is delivered through springs and 36respectively, while overthrow of the rod in either direction is taken upby the springs 102 and 104.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. In a machine for performing step-by-step operations upon a shoe part,a frame, a presserfoot, a presser-foot support slidably mounted in theframe, power-operated means for moving said presser-foot up and down,resilent means interposed between said power-operated means and thepresser-foot support whereby power of the said means is delivered to thepresser--foot support through said resilient means, means for preventingoverthrow of thepresser-foot support on the down stroke, and means forpreventing an overthrow of the pressen-foct support on the up stroke.

2. In a perforating machine operating to perforate the work step bystep, a frame, a presserfoot, 9. presser-foot supporting rod slidablymounted in the frame of the machine, abutments upon said rod uponopposite sides of the frame member, springs interposed between saidabutments and said frame member. and cooperable therewith to avoid noisein the operation of the machine, and power-operated means for movingsaid presser-foot rod.

3. In a perforating machine operating to perforate the work step bystep, a frame, a presserfoot, a presser-foot supporting rod slidablymounted in the frame of the machine, abutments on said rod upon oppositesides of the frame member, springs interposed between said abutments andsaid frame member and cooperable therewith to avoid noise in theoperation of the machine, and power-operated means for moving saidpresser-foot supporting rod, said power means beingresiliently'connected to the presserfoot rod.

4. In a machine for performing step-by-step operations upon a piece ofwork, a presser-foot, a presser-foot support mounted in said machine tocarry the presser-foot toward and away from the work, springsoperatively positioned between abutments on said presser-foot supportand a relatively fixed portion of the machine to prevent overthrow ofthe support upon up and down movements thereof and thereby to avoidnoise inv the operation of the machine, one of said springs beingshorter than the total range of movement between its coacting abutmentand the fixed part of the machine.

5. In a perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot carried by said rod, abutments on said rod onopposite sides of said frame member, springs operatively positionedbetween said abutments and the frame member constructed and arranged torender one of said springs inoperative when the other is compressed, andpower-operated means for raising and lowering said rod.

6. In a perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot carried by said rod, an abutment on said rod, apower-operated slide on said rod, a resilient member interposed betweensaid power-operated slide and said abutment constructed and arranged tobe inactive when the presser-foot is pressed against the work andcompressed when the presser-foot is moved away from the work, andresilient means for preventing overthrow of the presser-foot rod ineither direction.

7. In a perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot on said rod, a power-operated pitman for raisingand lowering the rod, and means for guiding pitman relatively to saidrod in a plane parallel thereto.

8. In a perforating machine, a frame, a rod slidably mounted vin saidframe, a presser-foot on said rod, an abutment on said rod, and apower-operated pitman for raising and lowering the rod, said pitmanbeing guided at one end by engagement with said abutment and at theother end by engagement with said rod.

9. In a perforating machine, a frame, a cylindrical rod siidabiy mountedin said frame, a presser-foot on said rod, an abutment block on said rodengaging a portion of the frame to prevent rotation of the rod, and apower-open ated pitman for raising and lowering the rod, said pit beingguided at one end by engagement with said abutment block and at theother end by engagement with said rod.

10. In perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot on said rod, an abutment on said rod, apoweroperated pitinan for raising and lowering the rod, said pitrnanbeing guided at one end by engagement with abutment and at the other endby engagement with said rod, and springs interposed between the oppositeends of said pitman and said presser-foot rod.

11. In a perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot on said rod, an abutment on said rod, a power--operated pitman for raising and lowering the rod, said pitman beingguided at one end by engagement with said abutment and at the other endby engagement with said rod, and means for preventing overthrow of thepresser-foot rod in both directions.

12. In a perforating machine, a frame, a rod slidably mounted in saidframaa presser-foot on said rod, an abutment on said rod, apower-operated pitman for raising and lowering the rod, said pitmanbeing guided at one end by engagement with said abutment and at theother end by engagement with said rod, springs interposed between theopposite ends of said pitman. and said presser-foot rod, and means forpreventing overthrow of the, presser-foot rod in both directions.

13. In a perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot' on said rod, abutments on said rod at oppositesides of a portion of said frame, a power-operated pitman havingresilient means between said pitman and one of said abutments, andsprings surrounding said rod in operative posi tion between said frameportion and said abutments to prevent overthrow of the rod.

14. In a perforating machine, a frame, a rod siidably mounted in saidframe, a presser-foot on said rod, an abutment on said rod, springs uponopposite sides of the abutment and adapted to engage said abutment,power-operated means adapted to engage the springs for actuating saidrod, and a manually-operated lever arranged for engagement with saidabutment to lift said presser-foot to permit the insertion of a piece ofwork.

15. In a perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot on said rod, an abutment carried by said rod atone side of the frame, a power-operated pitman having springs interposedbetween said pitman and said abutment whereby the operation of thepitman moves the rod to and fro, an adjustable stop upon said abutment,and a treadle-operated lever arranged for engagement with said stopwhereby actuation of the lever will move the presser-foot away from thework.

16. In a'perforating machine, a frame, a rod slidably mounted in saidframe, a presser-foot on said rod, an abutment carried by said rod atone side of the frame, a power-operated pitman having springs interposedbetween said pitman and said abutment whereby the operation of thepitrnan moves the rod to and fro, an adjustable stop upon said abutment,a treadle-operated lever arranged for engagement with said stop wherebyactuation of the lever will move the presser-foot away from the work,and springs surrounding said rod for cooperation with opposite sides ofsaid frame, thereby to prevent over.- throw of the rod.

PERLEY R. GLASS.

